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End-Tidal O2
Aka: End-Tidal O2, End-Tidal Oxygen, End Tidal O2, EtO2
- See Also
- End-Tidal CO2
- Definitions
- End-Tidal O2
- Measured concentration of oxygen in expired breath
- Measured by Face Mask or nasal detector that attaches to a monitor module (measures EtCO2 and EtO2)
- History
- Has historically been limited to operating room measurement, but is becoming available in Emergency Department in 2019
- Indications
- Endotracheal Intubation Preoxygenation
- Adjunct to Oxygen Saturation in identifying adequate preoxygenation (prevents desaturation during apnea)
- Ideal Oxygen Saturation prior to intubation: Approaching 100%
- Ideal End-Tidal Oxygen: >=85%
- Suggests adequate nitrogen wash-out in Functional Residual Capacity
- Ideal EtO2 is difficult to achieve without high oxgen flow rates or Positive Pressure Ventilation
- Caputo (2019) Ann Emerg Med 74(3):410-5 +PMID:30879700 [PubMed]
- References
- Swaminathan and Caputo in Herbert (2019) EM:Rap 19(12): 14-5